.Grandepa{
    border: 5px solid pink;
    width: 600px;
    height: 600px;
    margin: 10px
}
.Father{
    border: 5px solid green;
    width: 500px;
    height: 500px;
    margin: 10px
}
.Son{
    border: 5px solid yellow;
    width: 400px;
    height: 200px;
    margin: 10px
}